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Study of Accident Progression in Unsealed WWER-1000/V320 Reactor during Maintenance

Journal of Power and Energy Engineering 2016年第8期4卷 68-78页

作者： Pavlin Groudev Marina Andreeva Institute for Nuclear Research and Nuclear Energy-Bulgarian Academy of Sciences Sofia Bulgaria

This paper discusses the results obtained during an investigation of WWER-1000 Nuclear Power Plant (NPP) behavior at shutdown reactor during maintenance. For the purpose of the analysis is selected a plant operating state with unsealed primary circuit by removing the MCP head. The reference nuclear power plant is Unit 6 at Kozloduy NPP (KNPP) site. relap5/ mod3.2 computer code has been used to simulate the transient for WWER-1000/V320 NPP model. A model of WWER-1000 based on Unit 6 of KNPP has been developed for the relap5/mod3.2 code at the Institute for Nuclear Research and Nuclear Energy-Bulgarian Academy of Sciences (INRNE-BAS), Sofia. The plant modifications performed in frame of modernization program have been taken into account for the investigated conditions for the unsealed primary circuit. The most specific in this analysis compared to the analyses of NPP accidents at full power is the unavailability of some important safety systems. For the purpose of the present investigation two scenarios have been studied, involving a different number of safety systems with and without operator actions. The selected initiating event and scenarios are used in support of analytical validation of Emergency Operating Procedures (EOP) at low power and they are based on the suggestions of leading KNPP experts and are important in support of analytical validation of EOP at low power.

关键词： Nuclear Power Plant Safety relap5/mod3.2 computer code Unsealed WWER Type Reactor Residual Heat Removal System Low Power and Cold Conditions

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